EP4235552A2 - Verfahren und systeme zur effizienten übertragung von einheiten auf einem verteilten peer-to-peer-konto mittels blockchain - Google Patents

Verfahren und systeme zur effizienten übertragung von einheiten auf einem verteilten peer-to-peer-konto mittels blockchain Download PDF

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Publication number
EP4235552A2
EP4235552A2 EP23163312.4A EP23163312A EP4235552A2 EP 4235552 A2 EP4235552 A2 EP 4235552A2 EP 23163312 A EP23163312 A EP 23163312A EP 4235552 A2 EP4235552 A2 EP 4235552A2
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EP
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Prior art keywords
transaction
user
exchange
invitation
party
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EP23163312.4A
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English (en)
French (fr)
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EP4235552A3 (de
Inventor
Craig Steven WRIGHT
Stephane SAVANAH
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Nchain Licensing AG
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Nchain Licensing AG
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Priority claimed from GBGB1603125.4A external-priority patent/GB201603125D0/en
Priority claimed from GBGB1603123.9A external-priority patent/GB201603123D0/en
Priority claimed from GBGB1604493.5A external-priority patent/GB201604493D0/en
Application filed by Nchain Licensing AG filed Critical Nchain Licensing AG
Publication of EP4235552A2 publication Critical patent/EP4235552A2/de
Publication of EP4235552A3 publication Critical patent/EP4235552A3/de
Pending legal-status Critical Current

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Definitions

  • the present invention relates to distributed, peer-to-peer ledgers and, in particular, blockchain technologies.
  • the invention also relates in part to tokenisation and security techniques, and secure mechanisms for transferring entities and/or ownership of entities via a blockchain. It may comprise a method of performing secure transactions between different parties over a blockchain.
  • a blockchain is a peer-to-peer, electronic ledger which is implemented as a computer-based decentralised, distributed system made up of blocks which in turn are made up of transactions.
  • Each transaction is a data structure that encodes the transfer of control of a digital asset between participants in the blockchain system, and includes at least one input and at least one output.
  • Each block contains a hash of the previous block to that blocks become chained together to create a permanent, unalterable record of all transactions which have been written to the blockchain since its inception.
  • Transactions contain small programs known as scripts embedded into their inputs and outputs, which specify how and by whom the outputs of the transactions can be accessed. On the Bitcoin platform, these scripts are written using a stack-based scripting language.
  • Tx Transaction
  • miners Network nodes
  • UXO unspent transaction
  • a transaction in order for a transaction to be written to the blockchain, it must be i) validated by the first node that receives the transaction - if the transaction is validated, the node relays it to the other nodes in the network; and ii) added to a new block built by a miner; and iii) mined, i.e. added to the public ledger of past transactions.
  • Smart contracts are computer programs designed to automate the execution of the terms of a machine-readable contract or agreement.
  • a smart contract is a machine executable program which comprises rules that can process inputs in order to produce results, which can then cause actions to be performed dependent upon those results.
  • Another area of blockchain-related interest is the use of 'tokens' (or 'coloured coins') to represent and transfer real-world entities via the blockchain.
  • a potentially sensitive or secret item can be represented by the token which has no discernable meaning or value.
  • the token thus serves as an identifier that allows the real-world item to be referenced from the blockchain.
  • Tokenisation techniques can be used in respect of many different types of contexts where security, anonymity and cross-platform compliance are important.
  • One such application area is financial applications, although the present invention is not limited to use in relation to financial transactions.
  • 'blockchain' to include all forms of electronic, computer-based, distributed ledgers. These include, but are not limited to consensus-based blockchain and transaction-chain technologies, permissioned and un-permissioned ledgers, shared ledgers and variations thereof.
  • the most widely known application of blockchain technology is the Bitcoin ledger, although other blockchain implementations have been proposed and developed. While Bitcoin may be referred to herein for the purpose of convenience and illustration, it should be noted that the invention is not limited to use with the Bitcoin blockchain and alternative blockchain implementations and protocols fall within the scope of the present invention.
  • the present invention may provide solutions for the secure control and/or transfer or exchange of an asset via a blockchain.
  • entity may be used interchangeably with “asset”.
  • the invention may enable control and/or transfer of ownership of the asset.
  • This may be a digital or virtual asset such as a smart contract, or a real-world/physical asset.
  • the asset may be a right such as a licence or right to use or some sort of right relating to some type of property.
  • the invention may use tokenisation techniques to facilitate this control or transfer.
  • the invention may enable the transfer/exchange to be performed in a secure manner, incorporating the use of cryptographic keys, while not requiring any alteration of the underlying blockchain protocol.
  • the invention may use techniques for embedding metadata in a script associated with a blockchain transaction (Tx).
  • the invention provides, not least: enhanced optimisation of memory usage for electronic transfers, improved security and data integrity through the use of hashing techniques, improved security through the removal of a need for a trusted third party, and enhanced anonymity of data. It may also provide improved communication mechanisms to enable disparate or distinct parties to identify each other and/or exchange data via the novel methods and/or architectures provided by the invention. This list of advantages is not limiting or exhaustive.
  • the invention may require the interaction and inter-communication of various distinct and separate computer-based resources, such as one or more user devices and a distributed computer system (blockchain) which includes computing nodes arranged to execute blockchain-related software and protocols.
  • blockchain distributed computer system
  • the invention may provide a computer implemented method for efficient transfer of entities on a peer-to-peer distributed ledger (blockchain).
  • the method may comprise: generating a first exchange transaction, and broadcasting, over a first network, the first exchange transaction for inclusion on a P2P distributed ledger, wherein the first exchange transaction comprises: an indication of a first quantity of a cryptocurrency to be transferred; a first input provided from an output of a first invitation transaction from a first user, the first invitation transaction previously included on the P2P distributed ledger, a first script, a first user private key (V1A) associated with the first user, a first third-party private key (P1T) associated with a first third-party, and a first output indicating a transfer of a first entity from the first user to a second user; and wherein the first script comprises: a first set of metadata providing an indication of the first entity to be transferred and a first set of conditions for the transfer, a first user public key associated with the first user, the first user public key being a crypto
  • the hash of the (redeem) script may be provided within, or associated with, a blockchain transaction (Tx).
  • Tx may be a P2SH transaction in accordance with the Bitcoin protocol, or another functionally equivalent transaction type in another blockchain protocol.
  • the hash of the script may serve as a look-up key to a hash table or other storage resource.
  • This storage resource may be a public domain repository of invitations.
  • the storage resource may comprise the look-up key (ie the hash) and all the fields from the metadata which, in combination, define the invitation.
  • the look-up key may be a hash of the rest of the record i.e. a hash of the concatenated metadata values.
  • the metadata may comprise a pointer or other reference to the location of a contract associated with a token.
  • the contract may be stored in a separate storage resource.
  • the invitation (as defined by the metadata in the storage resource) may be linked to the blockchain transaction via the hash.
  • the exchange can be carried out securely on a peer-to-peer basis, thereby making a trusted third party unnecessary. This in turn avoids the need for a large amount of sensitive information about both parties to the exchange to be held by any third party such as a service provider, which in turn avoids the risks associated with that third party's security being compromised.
  • This advantage is provided while also preserving anonymity of the transactions. Since the first script is hashed, it would be impracticably difficult to change the values of the metadata without causing a change in the corresponding hash values of the script.
  • the advantage is also provided that the first metadata can be embedded in one or more of the places available for public keys in the first script, thereby enabling nodes not suitable for processing the metadata to simply transmit the script to a further node, as opposed to blocking its progress. This in turn improves computational efficiency of the related transactions.
  • control data can be incorporated into the metadata, for example an access code for a barrier in the case of a token representing a ticket for a venue or a travel ticket or voucher.
  • the metadata may also contain a pointed to an off-block repository of the details of the exchange, thereby enabling less memory and/or processing resources to be used in processing the related transactions.
  • the token can be divided, enabling two or more transaction outputs, each of which can relate to tokenised or untokenised electronically transferrable digital asset.
  • the method may further comprise: generating a second exchange transaction; and broadcasting, over the first network, the second exchange transaction for inclusion on a P2P distributed ledger, wherein the second exchange transaction comprises: an indication of a second quantity of a cryptocurrency to be transferred; a second input provided from an output of a second invitation transaction from the second user, the second invitation transaction previously included on the P2P distributed ledger, a second script, a second user private key associated with the second user, a second third-party private key associated with a second third-party, and a second output indicating a transfer of a second entity from the second user to a first user; and wherein the second script comprises: a second set of metadata providing an indication of the second entity to be transferred and a second set of conditions for the transfer, a second user public key associated with the second user, and a second third-party public key associated with the second third-party.
  • the invention may provide a computer implemented method for efficient transfer of entities on a peer-to-peer distributed ledger, the method comprising: generating a first exchange transaction; and broadcasting, over a first network, the first exchange transaction for inclusion on a P2P distributed ledger, wherein the first exchange transaction comprises: an indication of a first quantity of a cryptocurrency to be transferred; a first input provided from an output of a first invitation transaction from a first user, the first invitation transaction previously included on the P2P distributed ledger, a first script, a first user private key associated with the first user, a first third-party private key associated with a first third-party, a first output indicating a transfer of a first entity from the first user to a second user; an indication of a second quantity of a cryptocurrency to be transferred; a second input provided from an output of a second invitation transaction from the second user, the second invitation transaction previously included on the P2P distributed ledger, a second script, a second user private key associated with
  • generating the first exchange transaction comprises: sending the first script to the first user for signing with the first user private key; receiving the first script from the first user signed with the first user private key; sending the first script to the first third-party for signing with the first third-party private key; and receiving the first script from the first third-party signed with the first third-party private key.
  • generating the first exchange transaction further comprises: sending the first script to the second user for signing with the second user private key; receiving the first script from the second user signed with the second user private key; sending the first script to the second third-party for signing with the second third-party private key; and receiving the first script from the second third-party signed by the second third-party private key.
  • Generating of the second exchange transaction may comprise sending the second script to the second user for signing with the second user private key; receiving the second script from the second user signed with the second user private key; sending the second script to the second third-party for signing with the second third-party private key; and receiving the second script from the second third-party signed by the second third-party private key.
  • the method may further comprise sending a prompt to one or more of the first and second users to accept an exchange before generating or broadcasting the first and/or second exchange transactions.
  • the method may further comprise: receiving, from the first user, a first invitation to perform an exchange, the first invitation comprising the first set of metadata; generating the first script; hashing the first script to generate a first script hash; sending, over a second network, the first script and the first script hash; and sending, over the first network, the first invitation transaction for inclusion on a peer-to-peer (P2P) distributed ledger, the first invitation transaction comprising an indication of a third quantity of a cryptocurrency to be transferred and the first script hash.
  • P2P peer-to-peer
  • the method may further comprise: receiving, from the second user, a second invitation to perform an exchange, the second invitation comprising the second set of metadata associated with the invitation; generating the second script; hashing the second script to generate a second script hash; sending, over the second network, the second script and the second script hash; and sending, over the first network, the second invitation transaction for inclusion on a peer-to-peer (P2P) distributed ledger, the second invitation transaction comprising an indication of a fourth quantity of a cryptocurrency to be transferred and the second script hash.
  • P2P peer-to-peer
  • the first entity may be the first quantity of cryptocurrency. Additionally or alternatively, the second entity is the second quantity of cryptocurrency.
  • Sending of the first script and the first script hash over the first network comprises publishing the first script and the first script hash on a distributed hash table (DHT) or, alternatively, sending the first script and the first script hash to the second user.
  • DHT distributed hash table
  • the sending of the second script and the second script hash over the second network comprises publishing the second script and the second script hash on a distributed hash table (DHT) or, alternatively, sending the second script and the second script hash to the first user.
  • DHT distributed hash table
  • the P2P distributed ledger is the Bitcoin block chain.
  • the first third-party is an escrow service provider.
  • the second third-party may be an escrow service provider.
  • one or more of the first exchange transaction, the second exchange transaction, the first invitation transaction and the second invitation transaction is a pay-to-script-hash (P2SH) transaction.
  • P2SH pay-to-script-hash
  • the first script hash and the second script hash may be Base58 encoded.
  • the first entity and/or the second entity may be bitcoin, a contract, goods, or services.
  • the contract may be for one or more of fiat currency; title deeds; tickets; goods; services.
  • the first set of conditions and/or the second set of conditions may comprise one or more of the following: a) one or more range limits on one or more prices related to the exchange; b) an exchange rate; c) a deadline for fulfilment of the first invitation; d) a limitation on the geographical area for the exchange to take place.
  • Embodiment(s) of the invention may comprise a technique for embedding metadata in a (blockchain) transaction, comprising the steps of: generating a blockchain transaction (Tx) having an output (TxO) related to an asset (B1) and a hash of a redeem script which comprises:
  • the invention may provide a computer-implemented system arranged and configured to implement any method described above. Any feature(s) mentioned above in relation to one aspect or embodiment may be used in relation to any other embodiment or aspect. Any feature mentioned in relation to a method of the invention may apply equally to a corresponding, implementing system and vice versa.
  • processors operable to perform a method as described above.
  • a computer readable medium having stored thereon instructions which, when executed, are operable to perform a method as described above
  • the present invention generally relates to methods and apparatus for utilising a P2P distributed ledger, such as the Bitcoin blockchain, to enable parties to offer, request and exchange any type of entity of value.
  • a P2P distributed ledger such as the Bitcoin blockchain
  • Methods described herein enable the entry of an invitation (or order) to perform an exchange of entities as well as the enactment the actual exchange on acceptance of an invitation.
  • Embodiments therefore provide for a permanent record of all steps of an exchange process to be maintained.
  • each stage in the process can be secured using cryptographic locking techniques similar to those used in transactions of cryptocurrencies.
  • Methods described herein can also be used to exchange any type of entity. Examples of such entities include but are not limited to bitcoins, fiat currencies, contracts, goods and services.
  • cryptocurrency is meant an encrypted, electronically transferrable digital asset such as, but not limited to, Bitcoin.
  • a token is an exchangeable entity represented by a contract.
  • the contract may take one of several forms. For example, the contract may confer a right upon the holder or denote ownership of property.
  • the value of the token may be contractually specified and is linked to the underlying BTC amount via a ⁇ pegging rate'.
  • the token is exchangeable via a novel type of transaction using a cryptocurrency protocol such as the bitcoin protocol.
  • the bitcoin value on the transaction acts as a token representing a rights contract in digital form.
  • the contract itself may be stored on the blockchain or may be kept in a publicly accessible, off-block location, or may be held privately by the parties to the contract depending on the particular embodiment. Where the contract is not stored on the blockchain, the transaction may store a unique pointer, identifier or any other type of reference to the contract.
  • Tokens may be divisible.
  • a divisible token is one in which the value on the transaction output can be subdivided into smaller amounts which can be allocated across multiple new tokens. Examples of divisible tokens include tokens for fiat currency or for shares in a race horse. Divisible contracts may be defined as those that specify a non-zero pegging rate. In other words, the token value is tied to the underlying bitcoin value. Alternatively, tokens may be non-divisible.
  • a non-divisible token is a contract that specifies the holder's rights in terms of a fixed value, e.g. a contract to redeem a house or AU$1000. Non-divisible tokens are therefore not linked to the value of the underlying Bitcoin. Being non-divisible, they can only be transferred as a whole.
  • Tokens must be digitally signed by a token issuer to be valid.
  • the issuer may, for example be an authority such as a Registrar of Title deeds.
  • the issuer may issue a token to a user in return for payment. That token may then give the user the right to exercise the contract linked to the token, whether the contract represents the right to redeem fiat currency or for a service to performed or for the transfer of property (i.e. a title deed).
  • tokens in accordance with the above include the following:
  • the blockchain is a transaction ledger or database which is distributed across networked nodes participating in a system based on the Bitcoin protocol.
  • a full copy of a currency's block chain contains every transaction ever executed in the currency.
  • a continuously growing list of transactional data records is provided. Since each transaction entered onto the block chain is cryptographically enforced, the blockchain is hardened against tampering and revision, even by operators of the data store nodes.
  • the blockchain is used in a novel manner to enable a transfer of entities or assets between parties.
  • the exchange transfers control and/or ownership of the digital entity from one party to another.
  • the invention provides a mechanism for holding and recording invitations (or orders) to perform an exchange of one or more entities.
  • the invention thus provides a novel and advantageous communication solution which is conducted via the blockchain.
  • any type of entity or asset is exchangeable. These may be physical, "real world” entities, or virtual, digital entities. Examples of entities which may be exchanged include Bitcoins, tokens (representing any type of transferrable contract), and goods and services of any type. Tokens may represent a contract conferring specified rights upon the holder to be redeemed for fiat currency (virtual banknotes), to denote ownership of property (e.g., title deeds), or grant access to an event (tickets), to name a few of many examples. Goods and services may include new or second hand products, labour (e.g., charged by the hour), complete jobs (e.g., mowing the lawn), to name a few of many examples.
  • Tokens may represent a contract conferring specified rights upon the holder to be redeemed for fiat currency (virtual banknotes), to denote ownership of property (e.g., title deeds), or grant access to an event (tickets), to name a few of many examples.
  • FIG. 1 is a network diagram of a P2P exchange system 100 according to one embodiment.
  • the system 100 comprises a network 102 and a plurality of parties to the network.
  • the parties include an exchange service provider 104, a first user 106, a second user 108, an escrow service provider 110, and an issuer 112.
  • a combination of functions of the exchange service provider 104, the escrow service provider 110 and the issuer 112 may be undertaken by a single party. In other words, a single party could simultaneously perform the functions of each.
  • the exchange service provided 104 and escrow service provider 110 are optional, since the invention can be carried out entirely on the P2P exchange system without the use of those service providers 104, 110.
  • the exchange service provider 104 provides exchange services to a plurality of users, including the first user 106 and the second user 108.
  • the issuer 112 is optional to the network 102, as denoted by broken lines. As will be discussed in more detail below, the issuer 112 is required only when exchange of tokens is involved.
  • the network 102 is the internet. Accordingly, other parties (not shown) may be party to the network 102. All parties to the network 102 are able to communicate with all other parties to the network 102. Hosted on the network 102 are a peer-to-peer distributed hash table (P2P DHT) and a peer-to-peer distributed ledger (P2P DL). It will be appreciated that some or all of the parties shown in the system 100, together with those not shown, may act as host nodes to both or either of the P2P DHT and the P2P DL.
  • P2P DHT peer-to-peer distributed hash table
  • P2P DL peer-to-peer distributed ledger
  • An invitation may be structured include various parameters or codes. These can be used for various purposes, eg matching invitations as described in more detail below.
  • the following structure may be used: Offer-type-code Offer-QTY-max This is the amount of value e.g BTC that will be carried on the offerer's payment transaction. If the offerer is offering BTC than this value is simply the offerer's maximum BTC offer. If the offerer is offering tokenised currency then this value is the equivalent token value of the offerer's maximum offered currency amount (calculated based on the pegging rate specified on the tokenisation contract).
  • Offer-QTY-min Offer-Item-ID Offer-Description Keywords This is a Condition that must be set if the Offer is goods/service and there is no other identifier (such as an auction site catalogue number)
  • Token for token rate requested-share/offered-share (e.g. cents/rupiah, where token offered represents rupiah and requested is CAD) Note that this is only a convention for the sake of consistency and convenience and will make matching easier. The rate could be just as easily be converted into requested-satoshis/offered-satoshis based on the pegging rate used on the tokenisation contract. Rate-max Conditions This will be a code to indicate up to 8 conditions that will be coded in separate metadata fields. For example: . Deadline (in Unix time) . Location The format of these metadata fields depends on the type of condition.
  • Offer-Description and Request-Description are also considered conditions. They are usually not needed as all the information required normally be can be coded into the other metadata fields. If they are needed then they need to be flagged as existing by switch on the appropriate flags in the Conditions bitfield.
  • Request-type-code Request-item-ID Request-description Keywords This is a Condition that must be set if the Request is goods/service and there is no other identifier (such as an auction site catalogue number) Request-QTY-max Request-QTY-min
  • the exchange service provider 104 provides a gateway for users 106, 108 to place invitations (or orders) on both the P2P DHT and the P2P DL. Whilst users 106, 108 of the network 102 may themselves place invitations on both the P2P DHT and the P2P DL, the exchange service provider 104 provides a simplified interface to improve the efficiency with which invitations are generated and to reduce the dangers associated with direct handling of transactions on a distributed ledger, such as the bitcoin ledger (e.g., losing transactions etc.) as the skilled person will appreciate. In addition to enabling the publishing of user invitations on the P2P DHT and P2P DL, the exchange service provider may perform one or more of the following additional services:
  • a single service provider 104 is shown in the system 100 of Figure 1 . It will, however, be appreciated that one or more additional exchange service providers may be party to the network 102. Where more than one exchange service provider exists, users may choose an exchange service provider depending on their requirements, which may include, for example, the service provider's fee structure, location, compatibility etc. It will therefore be appreciated that, in certain circumstances, two users with matching invitations may be using different exchange service providers. In such circumstances, the users' respective exchange service providers may communicate between one another in order to facilitate an exchange.
  • an escrow service provider 110 may be party to the network 104.
  • the escrow service provider 110 enables a user's offer to be held (i.e. the amount offered is reserved) until a transaction is settled, or under certain conditions to cancel an order and have returned anything that was offered in an invitation.
  • the escrow service provider 110 acts as a neutral third party, trusted by two parties of a transaction, to provide an escrow service for transactions.
  • the system allows users participating in a final transaction to have a guarantee that the user making an offer can fulfil the offered amount (in bitcoins or tokens).
  • escrow may be party to the network 104. Users of the P2P exchange system 100 may also choose which escrow provider they use, if and when they use one. In some embodiments, the services of the escrow 110 may be incorporated into those of the exchange service provider 104 or vice versa. In such case, a separate escrow may not be required.
  • the system 100 may also comprise an issuer 112.
  • An issuer 112 may be involved where the transaction involves the exchange of a token. In such circumstances, the process involves the issuer signing the token. Every transaction involving the transfer of a token preferably involves the issuer 112.
  • the issuer's signature is required in the invitation transaction, in which the token is offered and held in escrow.
  • the issuer's signature may also be required in the exchange transaction, in which the payment of the token is made to the counterparty.
  • An important aspect of embodiments of the present disclosure is the ability to embed metadata concerning an invitation to perform an exchange in a bitcoin transaction (or other cryptocurrency transaction) as well as the ability to embed metadata concerning an actual exchange, in a bitcoin or other cryptocurrency transaction.
  • Embodiments described herein use multi-signature pay to script hash (P2SH) type transactions to enable such metadata embedding as described below.
  • P2SH multi-signature pay to script hash
  • the redeem script may take the form of: ⁇ NumSigs PubK1 PubK2 ... PubK15 NumKeys OP_CHECKMULTISIG> where
  • At least a number "m” of signatures corresponding to the public keys are required.
  • the order of the public keys is important and the number “m” out of "n” signatures for signing must be done in sequence. For example, say that "m” is two and the number of public keys "n” is fifteen.
  • two signatures are available for use, say Sig1 (corresponding to PubK1) and Sig 15 (corresponding to PubK15), the redeem script must be signed by Sig1 first followed by Sig15.
  • Metadata may be embedded in a P2SH in one or more of the 15 places available for the public keys in the redeem script.
  • the P2SH may take the form of: ⁇ NumSigs Metadata1 Metadata2...PubK1 PubK2... NumKeys OP_CHECKMULTISIG> where
  • This embedding method can be summarised as: generating a blockchain transaction (Tx) having an output (TxO) related to a portion of cryptocurrency and a hash of a redeem script which comprises:
  • multi-signature P2SH bitcoin transactions offers several advantages. Firstly, they enable an invitation transaction to carry a metadata payload. Secondly, they facilitate the use of escrow services in an exchange transaction. Thirdly, where tokens are transferred in an exchange, they allow an exchange transaction to carry metadata associated with the one or more tokens being exchanged. Also, the underlying blockchain protocol is agnostic to the fact that metadata is being transmitted via the transaction. Therefore, no change is required to the blockchain protocol to convey this information.
  • Metadata may include a description or keyword describing an offer or request in an invitation transaction. Metadata may also include conditions associated with the invitation. For example, a deadline date may be attached to the invitation which may specify a time and/or date by which the order must be fulfilled. Where a deadline condition is provided with an invitation transaction, a cancellation transaction may be generated which spends the same BTC amount and contains a locktime representing the deadline for the exchange to take place. The cancellation transaction may be prevented from being distributed on the P2P DL until the locktime. If the exchange does not take place by the deadline, the cancellation transaction is added to the P2P DL and effectively pays back the payer and or service provider.
  • a deadline date may be attached to the invitation which may specify a time and/or date by which the order must be fulfilled.
  • a cancellation transaction may be generated which spends the same BTC amount and contains a locktime representing the deadline for the exchange to take place. The cancellation transaction may be prevented from being distributed on the P2P DL until the locktime. If the exchange does not take place by the deadline
  • the exchange transaction may spend the amount, creating a double-spend that hits the P2P DL ahead of the time-locked cancellation transaction, thereby blocking the cancellation transaction.
  • the metadata may not include a deadline, but instead the cancellation transaction can be solely responsible for cancelling the original invitation transaction.
  • the deadline metadata condition may not automatically cause the spending of a cancellation transaction.
  • the deadline may be a soft deadline which remains at the payer's control. This deadline may, therefore, be extended by a party simply allowing it to lapse and still accept late matching invitations. Equally, a service provider may still attempt to match off an expired order if it remains unspent.
  • a user may wait until after the deadline and manually enter the cancellation transaction if and when he so wishes.
  • Conditions may also include one or more location conditions which may specify, for example, that a transaction(s) is only broadcast onto the P2P DL if the location of the transactional broadcast is within X metres of specified coordinates. This ensures that the transaction can only take place at a specified location, for example, Bob's coffee shop.
  • a facility may exist that enables users to create their own new conditions and add them to the list of conditions by allocating them a previously unused condition-code. This facility may be resistant to abuse. For example, each service provider simply may make public their own table of conditions along with an associated condition-code and other parties to the system 100 can choose to adopt the same coding and may also add new ones of their own. Then if disputes arise due to, for example, re-use of condition code, the disputes may be resolved by the service provider or other users of the system 100.
  • Alice wants to buy some tokenised Canadian dollars (CAD) for bitcoin.
  • Alice contacts her exchange service provider 104 through, for example, a web interface or via an app running on a tablet or cell phone.
  • Alice logs into the service provider's 104 web interface.
  • Alice sends details of her invitation, including entities to be exchanged (tokenised CAD for bitcoin) and conditions of the exchange and any selected options offered by the service provider, to the service provider.
  • Alice may input this information into an interface hosted by the service provider 104, for example using normal language which can then be translated by the service provider 104 into a valid invitation or, alternatively, Alice may simply enter the information by pre-selecting options, e.g., via drop-down selection menus.
  • Alice receives from the service provider 104 a redeem script which has been generated by the service provider 104 based on her selections and includes information concerning the entities Alice wishes to exchange and any conditions associated with the invitation. Because Alice has signed up to use the particular service provider 104, the service provider 104 may already have Alice's public key. Alternatively, Alice may provide her public key to the service provider 104 either during the initial selection, or in response to a request from the service provider 104.
  • Alice signs the redeem script at step 210 using her private key, which is a cryptographic pair to her public key, and at step 212 sends the signed redeem script back to the service provider 104 to be distributed.
  • This process may be supported with the use of an app, which may itself be provided by the service provider 104.
  • the flow diagram 300 shown in Figure 3 illustrates the corresponding process performed by the service provider 104.
  • the service provider 204 receives the invitation details from Alice and generates a redeem script at step 304 using Alice's public key, the entity details and the conditions of the invitation.
  • the redeem script may be in a format suitable for a P2SH Bitcoin transaction; the invitation details may be stored in metadata fields in place of 32-byte public keys usually used in multisig unlocking scripts.
  • Figure 4 illustrates a format of the metadata for Alice's invitation, according to one embodiment.
  • Alice requests tokenised CAD and offers bitcoins in return at a rate of no less than 400 CAD/bitcoin.
  • Figure 4 also shows a deadline condition which may be added to the invitation.
  • the deadline condition may cause the invitation to be revoked at the deadline in the event that an exchange has not been finalised based on the invitation.
  • the redeem script is then sent to Alice for signing.
  • the service provider 104 Upon receipt of a signed redeem script from Alice, at step 308 the service provider 104 generates a hash of the signed redeem script.
  • the service provider 104 uses the hash in two ways. Firstly, at step 310, the service provider 104 lists the invitation details along with the hash on the publicly available P2P DHT. As mentioned above, this table employs the torrent technique so it is distributed rather than centralised and hence it will remain publicly accessible and safe from adulteration. Other service providers 104 are then able to access the invitation and list it on their own site (indeed, the service provider 104 may simply use the hash table as the sole repository and need not even maintain its own local database of invitations.
  • the second way the hash is used is to create a locking script of a bitcoin transaction, at step 312.
  • This transaction spends an amount of Alice's bitcoins to a P2SH script requiring 2 signatures to unlock: Alice's signature and that of her nominated escrow service provider 110 (which, as mentioned above, might or might not be the same entity as the service provider 104).
  • the purpose of this transaction is twofold. Firstly, the invitation is logged on the P2P DL. Any user or their service provider can verify that the invitation on the P2P DHT is legitimate by ensuring that there exists a matching transaction on the P2P DL (via the matching hash values). Secondly, the transaction 'locks' the commitment made by Alice in her invitation; the amount of bitcoin Alice is offering in exchange for tokenised CAD is the amount spent by the order transaction. Thus, it can be verified that the order is backed by sufficient funds.
  • Bob wants to sell some of his tokenised CAD for BTC and has independently listed his own invitation either using the same or a different service provider to the service provider 104 used by Alice.
  • Bob's order too, has been listed on the hash table and embedded in a P2P DL transaction as described with reference to Figures 2 and 3 .
  • the metadata of Bob's invitation is illustrated in Figure 5 .
  • a process 400 of matching Alice and Bob's orders is described.
  • the service provider 100 is described as performing the process.
  • any exchange service provider or, indeed, any other suitable third-party may perform the process 400.
  • the exchange service provider 104 may run a matching algorithm operable to identify a full or partial match between Alice's and Bob's invitations.
  • the exchange service provider 104 scans the P2P DHT for matching entity details. During the scans, the service provider 104 checks for a match between the entity details of Alice's and Bob's invitations. If a match is not found at step 404, then the process returns to step 402 and the exchange service provider 104 continues to scan the P2P DHT for matching entity details. If a match is found at step 404, the process 400 continues to step 406 where a check is made for a match between one or more of the conditions of each of Alice and Bobs' invitations. If no match is found at step 406, the process returns to step 402. If a match between one or more conditions is found then the process moves to step 408 in which the exchange service provider 104 attempts to create and finalise a transaction between Alice and Bob.
  • a direct match of all conditions in the two invitations may not be required at step 406 for a positive match to be confirmed. Indeed, the process 400 may only require that some of the conditions match. Additionally or alternatively, one or more the conditions need not fully match. For example, if conditions being compared are exchange rates proposed in each condition, the process 400 may confirm a positive match provided the rates are within a predetermined threshold range of each other. For example, if Alice proposes a minimum rate condition of 4 ⁇ 10 -5 tokenised CAD/satoshi and Bob's equivalent maximum proposed rate is 3.9 ⁇ 10 -5 tokenised CAD/satoshi, the process may still confirm or propose a condition match even though Bob's offered rate doesn't quite satisfy Alice's original requirements.
  • the conditions might be respective values for goods and services proposed in an offer and request.
  • the process 400 may again confirm a positive match provided the two values are within a predetermined threshold range of each other.
  • the predetermined threshold range may be, for example, a discrete value or a percentage of the offer value or request value.
  • the transaction metadata for each or both of Bob and Alice's invitations may further comprise one or more location conditions which may specify, for example, that a transaction(s) is only broadcast onto the P2P DL if the location of the transactional broadcast is within X metres of specified coordinates. This ensures that the transaction can only take place at a specified location, for example, Bob's coffee shop.
  • one or more intervening steps may be performed. These may include an alert to the parties that a match has been found, followed by a request to each or both parties for confirmation that they wish to proceed, etc. For example, as discussed above, where a condition is nearly but not fully met by one or more users, a match may still be recorded but not finalised until all parties are happy with the conditions of the invitations. This process may lead to counter offers to negotiate a final agreement on conditions, which may then lead to the generation of further invitations in accordance with processes described above.
  • the final exchange may be executed by creating one or more bitcoin transactions that spend the outputs of each invitation transaction.
  • the inventors have found several novel methods of completing the transaction, which may depend on circumstances including but not limited to: the users involved in the transaction, the entities being exchanged, and the service providers and issuers involved in the transactions. Some examples of these methods are described below.
  • a transaction table 500 for the separate transactions for Alice-Bob and Bob-Alice is shown in Figure 7 and a schematic diagram 600 of the transaction flow is shown in Figure 8 .
  • values provided in the transaction table 500 are shown for example only.
  • Alice's bitcoin in her invitation transaction are spent to Bob
  • Bob's CAD-tokenised bitcoin in his invitation transaction are spent to Alice.
  • the input 602 of this transaction is provided from the output of the invitation transaction which was placed on the P2P DL with Alice's invitation.
  • the input script is signed by both Alice and the escrow service provider 110 (assuming Alice is happy for the transaction to proceed).
  • the script unlocks the spent bitcoins which can then be output to a) Bob as his payment in return for the tokenised CAD (604), b) the exchange service provider 104 as payment for the exchange (606), and c) to Alice as change if any is due (608).
  • the first input 610 of the transaction is provided from the output of the invitation transaction which was placed on the P2P DL with Bob's invitation. Because the input to this transaction is tokenised, the input script needs to be signed by both Bob and his token issuer. In this circumstance, the token issuer may also operate as an escrow, thereby withholding the funds until Bob (and optionally Alice) are satisfied with the transaction.
  • the signed script unlocks the spent tokens which can then be output to a) Alice as payment in return for the BTC (612), and b) back to Bob as a change token to the value of the original token less the value sent to Alice (614).
  • the second input 616 is from a previous bitcoin transaction of Bob's.
  • This input is unlocked and output to a) the service provider 104 as payment for the exchange, b) the bitcoin miner as a fee for the exchange transaction and c) to Bob as change in bitcoin to the value of the original bitcoin input value less the service provider's 104 fee and the miner's fee.
  • the service provider's 104 fee for each transaction may be a slice of the value of the transaction.
  • the fee may be a slice of the exchange rate spread between corresponding rate conditions presented in the two invitations.
  • the service provider 104 may fulfil both sides of the exchange at the asking rate of each and retain the difference as the fee.
  • a flat fee in satoshis, tokenised currencies or other
  • the service provider might not extract a fee via the actual transactions.
  • a user may be charged fees outside of the transaction. For example, a user may be charged a membership fee or a per transaction invoice for one or more transaction (per transaction or on account etc.).
  • Bob and Alice's respective service providers may remove their invitation entries from the P2P DHT or enter a further entry which nullifies the original entry. For example, a service provider may simply leave the entry on the P2P DHT since the entry corresponds to a spend transaction, which implies that the invitation is no longer valid. Alternatively, a service provider may mark the transaction with a field that specifies that it has been spent. This may be a separate field on the DHT which corresponds to a particular entry but does not change the actual metadata associated with the invitation (this ensures that the script hash still matches the hash on the transaction). Alternatively, a service provider may delete the entry from the P2P DHT.
  • a benefit of the P2P DHT is a permanent audit control for transaction using the system 100.
  • deletion of entries from the P2P DHT is prevented or deleted entries are archived so as to maintain a record of the entry.
  • deleted entries are archived.
  • FIG. 9 shows an alternative transaction example in which a puzzle is exchanged in Alice's transaction (Alice-Bob). By doing so, the two transactions are locked together so that one cannot be spent without the other also being spent. This prevents a transaction going through from one party to another without the opposite transaction also going through.
  • FIG 10 shows a transaction table 700 for the single transaction between Alice and Bob.
  • the transaction flow for the exchange is the same as that of the previous two examples, i.e. as shown in Figure 6 .
  • the exchange is consolidated into a single multi-input-multi-output (MIMO) transaction.
  • MIMO multi-input-multi-output
  • two separate fees are paid to the exchange service provider 104.
  • the exchange service provider 104 is the same for both Bob and Alice, these two fees may be consolidated into a single transaction, paid by Bob, Alice or both Bob and Alice.
  • Alice wishes to exchange tokenised CAD for tokenised GBP
  • Bob wishes to exchange tokenised GBP for tokenised AUD
  • Carol wishes to exchange tokenised AUD for tokenised CAD.
  • Alice's tokenised CAD can go to Carol
  • Bob's tokenised GBP can go to Alice
  • Carol's tokenised AUD can go to Bob.
  • Figures 11A to 11C show exemplary transaction tables for transaction between Alice, Bob and Carol.
  • FIG. 11A a transaction table is shown for the payment from Alice to Carol.
  • Alice has $1500 of tokenised CAD and needs tokenised GBP500 from Bob.
  • the transaction pays tokenised CAD1000 to Carol from Alice and Alice payers herself the remaining tokenised CAD500 (1500-1000).
  • Alice may pay the service provider's fee (which may be a flat fee as is shown in Figure 11A or a fee dependent on the value of the transfer) and pays herself the change minus 1000 satoshis for the miner.
  • FIG. 11B a transaction table is shown for the payment of tokenised GBP to Alice from Bob.
  • Bob has tokenised GBP750 and needs tokenised AUD from Carol.
  • the transaction pays tokenised GBP500 to Alice from Bob and Bob payers himself the remaining tokenised GBP250 (750-500).
  • Bob may pay the service provider's fee (which may be a flat fee as is shown in Figure 11B or a fee dependent on the value of the transfer) and pays himself the change minus 1000 satoshis for the miner.
  • FIG. 11C a transaction table is shown for the payment of tokenised AUD to Carol from Bob.
  • Carol has tokenised AUD1500 and needs tokenised CAD from Alice.
  • the transaction pays tokenised AUD1000 to Bob from Carol and Carol payers herself the remaining tokenised AUD500 (1500-1000).
  • Carol may pay the service provider's fee (which may be a flat fee as is shown in Figure 11C or a fee dependent on the value of the transfer) and pays herself the change minus 1000 satoshis for the minor.
  • an exchange is composed of two or more separate transactions (e.g.
  • the transactions may be linked so as to ensure that either every party receives their entitlement or none of them do. This may be achieved by satisfying the following condition (using an example of two parties, A and B, but easily extendable to three or more parties):
  • the transaction output transferring from A to B exists and is spendable by B only if the transaction output transferring from B to A also exists and is spendable by A at the same time, and vice versa.
  • party A and party B refer to the required set of signatories for each transaction, not just Alice and Bob (for example, it may include token Issuers, escrow, etc.).
  • a service provider parsing the P2P DHT for matching orders
  • users themselves may scan or browse the P2P DHT to view the current invitations. Browsing may be facilitated by a third-party, such as the exchange service provider 104.
  • the third-party may provide an interface within which users can browse, scan and search for invitations which they might be interested in.
  • Users may then skip the process of entering their own prospective invitation on the P2P DHT, but instead choose to create an invitation which matches or nearly matches the order which they're interested in.
  • Bob may find Alice's invitation on the P2P DHT via a browsing or searching interface. In which case Bob may enter his own invitation to match that of Alice's. Bob may do this in one of several ways. In one example, there may be a facility on the interface which displays Alice's order to 'Accept' her order. If Bob is a client of the same exchange service provider 104 as that which Alice used for the invitation, they may already have access to Bob's eWallet (public key etc.) and can thus create the matching order based on such information.
  • the exchange service provider 110 may generate a redeem script for the matching invitation, send this to Bob for signing, receive the signed redeem script and enter the order onto the P2P DL in preparation for the transaction. If Bob is not a client of Alice's exchange service provider 104, a facility may be provided to allow Bob to enter the required information and authorisations that can then enable the Service provider to create Bob's matching order. The same process as that described above with reference to Figures 7 and 8 may then follow.
  • BTC for token of any type (i.e. representing any contract, not just for currency contracts), token of any type for token of any other type, BTC for goods/services, tokens for goods/services, or goods/services for goods/services.
  • BTC for token of any type (i.e. representing any contract, not just for currency contracts)
  • token of any type for token of any other type BTC for goods/services
  • tokens for goods/services or goods/services for goods/services.
  • the above process can be modified to exchange of BTC for BTC, although such an exchange has no real meaning.
  • the transaction (of the goods and/or services) comprises a description of the goods or services involved in the exchange.
  • the description does not form a contract.
  • description metadata may include one or more of the following: a) a general description of a desired item offered or requested, e.g., "dishwasher, ⁇ 3 yo", b) reference to a specific item for sale on an auction website, e.g., "second hand product put up for sale on an auction site", c) any number of an item type, e.g., advertise 15 t-shirts for sale that can be bought as singles or any quantity up to 15, d) reference to cash, in any specified currency, e) description of labour and payment per single job completion or for regular lawn mowing (repeating job) with payment per repetition or hour, or f) one or more keywords, e.g. "dishwasher”.
  • services may be backed by a contract as with a token.
  • a service may be divisible into shares, and non-divisible services may be considered as one-time jobs, i.e. divisible but comprising a single share (1 share). If the service is non-divisible, it may be treated as a token for the purposes of invitation and exchange. Where an item is backed by a token it is treated as a token for the purposes of both invitation and exchange and is exchanged in the same manner as other tokens, such as tokens for fiat currency.
  • An example of a transaction involving a physical item associated with a unique identifier will now be described. Similar to previous examples, in the present example, Alice has used her exchange provider to place an invitation on the P2P DL and P2P DHT.
  • the invitation includes a description that she will buy a physical item having unique identifier XYZ123, which may relate to Rafael's masterpiece Deposition of Christ, for no more than 2500 BTC. Equally, Bob may have placed a matching invitation that he will sell item XYZ123 for no less than 2400 BTC.
  • Alice may have browsed the P2P DL and found the item with item number XYZ123 and placed a matching order based on this information or, alternatively, Alice may have placed a generic invitation which was then matched by a third party, e.g., an exchange service provider, and subsequently a new invitation including the catalogue item number and description was made to match Bob's order.
  • a third party e.g., an exchange service provider
  • each exchange service provider may generate a unique identifier for the device.
  • each exchange service provider may, for example, have their own unique code prefixed to numbers they use to uniquely identify products being advertised on the P2P DL.
  • Metadata may be required to describe the maximum and minimum quantity of items which can be bought with any one transaction. For example, Alice may place invitation inferring that she will sell up to 15 Dead Lizard 2015 concert tour t-shirts for 0.025 BTC each - at least 5 per transaction.
  • metadata values may include a minimum rate (0.025BTC / items); a maximum quantity (Offer-QTY-max (15)) and a minimum quantity (Offer-QTY-min (5)).
  • the table below summarises the metadata associated with the invitation.
  • a ContractType 0x0000FF01 Indicates P2P Exchange Order Contract Pointer IPv6 address of the actual contract file location
  • OfferRequestCodes Coded value indicating Offer-type (4 bits) + Request-type (4 bits)
  • Conditions 00000011 2 Bitfield - flags indicating the presence of extra conditions in metadata fields Rate-min 0.025 BTC / item Rate-max C Offer-QTY-max 15 Maximum quantity of t-shirts per sale Offer-QTY-min 5 Minimum quantity of t-shirts per sale Request-QTY-max Request-QTY-min D Offer-Item-ID 01245D2SA Unique ID related to item Request-item-ID
  • the actual BTC value on the payment transaction will then be calculated by an exchange service provider. Because this transaction simply represents an invitation to perform and exchange, the actual value of the transaction may be small, e.g. as small as dust (546 satoshis). Alternatively, as described below, the value may be a nominal amount required by a service provider to guarantee an invitation (e.g. so Alice is incentivised not to pull out).
  • goods in the form of hard currency may be exchanged.
  • Alice may place an invitation to sell Bitcoin for Canadian dollars (hard currency instead of tokenised) with a maximum purchase of 150 BTC.
  • the invitation may additionally include a location condition that the exchange must take place at her shop address only: 371 Whimsy Avenue, Brentford.
  • Bob may then bring the cash to Alice's shop to hand over in exchange for a payment in bitcoin transaction.
  • the actual digital transaction of Bitcoin to Bob and of the digital record of transfer of hard cash to Alice may then take place once Bob and Alice have met in her shop for the physical transfer.
  • the transaction on the P2P DL exists as a record only and not for exchanging any value between parties (apart from any fees to service providers etc.). Users may use the system and opt to pay the nominal service fee for entry of the transaction onto the P2P DL so that the exchange is permanently recorded.
  • the original invitation transactions act as invitations only and not as value transfer or as records of events. If a goods-for-goods exchange occurs, such that the exchange involves physical items only, the final exchange need not be recorded on the P2P DL, since the P2P DL is not required to complete any transactions in the final exchange. Notwithstanding, if parties to the exchange of physical items wish to record the exchange on the P2P DL, they may each spend their invitation transactions to one another subject to a fee for the miner for doing so. If the parties do not wish to record the final exchange on the P2P DL, they may each spend their invitation transactions back to themselves, or even leave them unspent on the P2P DL.
  • the amount spent on the above transactions might not represent the offered amount in some cases, particularly when Alice's offer is not bitcoin or tokens but goods/service. Instead, the Service Provider might require a 'deposit' by Alice of an amount representing the value of the goods, or might only require a nominal amount if Alice is able to 'guarantee' the offer in another way, or (iii) might itself provide the bitcoins on Alice's behalf (she might not have any) and cover this funding cost by whatever means they charge a fee to the client.
  • users' invitations are published on a P2P DHT.
  • a user's invitation e.g. the script and script hash
  • a user's invitation may be stored locally by a service provider.
  • the service provider may host a private auction in which only certain users can access the user's invitation details.

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